Rename Markdown util `getHeaders()` to `getHeadings()` (#4031)

* Renamed getHeaders() to getHeadings(), according to RFC #208.

* chore: update changeset

* fix: expose MarkdownHeading type from `astro`

Co-authored-by: Félix Sanz <me@felixsanz.com>
Co-authored-by: Nate Moore <nate@astro.build>

3 files changed, 12 insertions, 12 deletions

diff --git a/examples/docs/src/components/RightSidebar/MoreMenu.astro b/examples/docs/src/components/RightSidebar/MoreMenu.astro
index a78f86d59..9b0e426cf 100644
--- a/examples/docs/src/components/RightSidebar/MoreMenu.astro
+++ b/examples/docs/src/components/RightSidebar/MoreMenu.astro
@@ -8,7 +8,7 @@ const showMoreSection = CONFIG.COMMUNITY_INVITE_URL || editHref;
 {showMoreSection && <h2 class="heading">More</h2>}
 <ul>
 	{editHref && (
-		<li class={`header-link depth-2`}>
+		<li class={`heading-link depth-2`}>
 			<a class="edit-on-github" href={editHref} target="_blank">
 				<svg
 					aria-hidden="true"
@@ -32,7 +32,7 @@ const showMoreSection = CONFIG.COMMUNITY_INVITE_URL || editHref;
 		</li>
 	)}
 	{CONFIG.COMMUNITY_INVITE_URL && (
-		<li class={`header-link depth-2`}>
+		<li class={`heading-link depth-2`}>
 			<a href={CONFIG.COMMUNITY_INVITE_URL} target="_blank">
 				<svg
 					aria-hidden="true"
diff --git a/examples/docs/src/components/RightSidebar/RightSidebar.astro b/examples/docs/src/components/RightSidebar/RightSidebar.astro
index f61fb010f..1406b065e 100644
--- a/examples/docs/src/components/RightSidebar/RightSidebar.astro
+++ b/examples/docs/src/components/RightSidebar/RightSidebar.astro
@@ -2,12 +2,12 @@
 import TableOfContents from "./TableOfContents.tsx";
 import MoreMenu from "./MoreMenu.astro";
 const { content, githubEditUrl } = Astro.props;
-const headers = content.astro.headers;
+const headings = content.astro.headings;
 ---
 
 <nav class="sidebar-nav" aria-labelledby="grid-right">
 	<div class="sidebar-nav-inner">
-		<TableOfContents client:media="(min-width: 50em)" {headers} />
+		<TableOfContents client:media="(min-width: 50em)" {headings} />
 		<MoreMenu editHref={githubEditUrl} />
 	</div>
 </nav>
diff --git a/examples/docs/src/components/RightSidebar/TableOfContents.tsx b/examples/docs/src/components/RightSidebar/TableOfContents.tsx
index 537508ab4..1d74e820f 100644
--- a/examples/docs/src/components/RightSidebar/TableOfContents.tsx
+++ b/examples/docs/src/components/RightSidebar/TableOfContents.tsx
@@ -1,11 +1,11 @@
 import type { FunctionalComponent } from 'preact';
 import { h, Fragment } from 'preact';
 import { useState, useEffect, useRef } from 'preact/hooks';
+import { MarkdownHeading } from 'astro';
 
-const TableOfContents: FunctionalComponent<{ headers: any[] }> = ({ headers = [] }) => {
+const TableOfContents: FunctionalComponent<{ headings: MarkdownHeading[] }> = ({ headings = [] }) => {
 	const itemOffsets = useRef([]);
 	const [activeId, setActiveId] = useState<string>(undefined);
-
 	useEffect(() => {
 		const getItemOffsets = () => {
 			const titles = document.querySelectorAll('article :is(h1, h2, h3, h4)');
@@ -27,18 +27,18 @@ const TableOfContents: FunctionalComponent<{ headers: any[] }> = ({ headers = []
 		<>
 			<h2 class="heading">On this page</h2>
 			<ul>
-				<li class={`header-link depth-2 ${activeId === 'overview' ? 'active' : ''}`.trim()}>
+				<li class={`heading-link depth-2 ${activeId === 'overview' ? 'active' : ''}`.trim()}>
 					<a href="#overview">Overview</a>
 				</li>
-				{headers
+				{headings
 					.filter(({ depth }) => depth > 1 && depth < 4)
-					.map((header) => (
+					.map((heading) => (
 						<li
-							class={`header-link depth-${header.depth} ${
-								activeId === header.slug ? 'active' : ''
+							class={`heading-link depth-${heading.depth} ${
+								activeId === heading.slug ? 'active' : ''
 							}`.trim()}
 						>
-							<a href={`#${header.slug}`}>{header.text}</a>
+							<a href={`#${heading.slug}`}>{heading.text}</a>
 						</li>
 					))}
 			</ul>